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457698

Sigma-Aldrich

(R)-(+)-2-Methyl-CBS-oxazaborolidine solution

1 M in toluene

Synonym(s):

α,α-Diphenyl-D-prolinolmethylboronic acid cyclamide ester, (R)-1-Methyl,3,3-diphenyl-tetrahydro-pyrrolo(1,2-c)(1,3,2)oxazaborole, (R)-Tetrahydro-1-methyl-3,3-diphenyl-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaborole

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5 ML
$90.06
25 ML
$335.54

About This Item

Empirical Formula (Hill Notation):
C18H20BNO
CAS Number:
112022-83-0
Molecular Weight:
277.17
MDL number:
MFCD00078440
UNSPSC Code:
12352005
PubChem Substance ID:
24869385
NACRES:
NA.22

$90.06

List Price$113.00Save 20%
Web-Only Promotion

Available to ship onApril 23, 2025Details

Request a Bulk Order

Quality Level

200

concentration

1 M in toluene

bp

111 °C

density

0.95 g/mL at 25 °C

functional group

phenyl

storage temp.

room temp

SMILES string

[H][C@]12CCCN1B(C)OC2(c3ccccc3)c4ccccc4

InChI

1S/C18H20BNO/c1-19-20-14-8-13-17(20)18(21-19,15-9-4-2-5-10-15)16-11-6-3-7-12-16/h2-7,9-12,17H,8,13-14H2,1H3/t17-/m1/s1

InChI key

VMKAFJQFKBASMU-QGZVFWFLSA-N

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Application

CBS Catalysts for Asymmetric Reduction and Asymmetric Synthesis
(R)-(+)-2-Methyl-CBS-oxazaborolidine solution [1M in toluene] may be used as a catalyst in the asymmetric borane reduction of perfluoroalkyl ketones.[1]
It may also be used in the preparation of:
  • (-)-diospongin B[2]
  • (1R)-2-azido-1-(2,2-dimethyl-4H-1,3-benzodioxin-6-yl)ethanol[3]
  • (S)-α-deuteriobenzyl alcohol[4]
  • (3S,4R,5S)-1-(trimethylsilyl)-4,5-epoxyhex-1-yn-3-ol[5]
Excellent catalyst of asymmetric reductions.[6][7]
The CBS (Corey-Bakshi-Shibata) oxazaborolidine catalyst has been used in the asymmetric reduction of prochiral ketones.[8][9][10] Other applications include the enantioselective synthesis of α-hydroxy acids,[11][12] α-amino acids,[13][14] C2 symmetrical ferrocenyl diols,[15] and propargyl alcohols.[16][17]
Used in a desymmetrizing reduction leading to (S)-4-hydroxycyclohexenone.[18]

Physical form

Precipitate may form in storage, but does not affect product quality. Gently heat product to 80−90 °C under an inert atmosphere to redissolve solids.

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Danger

Hazard Classifications

Aquatic Chronic 3 - Asp. Tox. 1 - Eye Dam. 1 - Flam. Liq. 2 - Repr. 2 - Skin Irrit. 2 - STOT RE 2 - STOT SE 3

target_organs

Central nervous system

Storage Class

3 - Flammable liquids

wgk_germany

WGK 3

flash_point_f

39.2 °F - closed cup

flash_point_c

4 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter

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Certificates of Analysis (COA)

Lot/Batch Number
0000394479
0000394478
0000394477
0000379062
0000382451

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Enantiomeric resolution of fluorous mixture by chiral CD columns: asymmetric reduction of a mixture of fluorous ketones.
Nakamura Y, et al.
Tetrahedron Letters, 44(33), 6221-6225 (2003)
The discovery of long-acting saligenin ? 2 adrenergic receptor agonists incorporating hydantoin or uracil rings.
Procopiou PA, et al.
Bioorganic & Medicinal Chemistry, 19(14), 4192-4201 (2011)
Stereoselective glycosylations of a family of 6-deoxy-1, 2-glycals generated by catalytic alkynol cycloisomerization.
McDonald FE, et al.
Journal of the American Chemical Society, 122(18), 4304-4309 (2000)
Synthesis, 2643-2643 (2006)
Stereoselective synthesis of (-)-diospongins A and B and their stereoisomers at C-5.
Kawai N, et al.
Tetrahedron, 63(37), 9049-9056 (2007)
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Articles

CBS Catalysts

we are pleased to offer both enatiomers of 2-methyl-CBS-oxazaborolidine as a dry reagent, in addition to our current offerings as a 1M solution in toluene.

Asymmetric Catalysis with Chiral Oxazaborolidinium Ions (COBIs)

Learn about the applications of chiral oxazaborolidinium ions (COBIs) as Lewis acid catalysts in different asymmetric reactions such as cyclopropanation, epoxidation, and radical reactions along with details of their catalytic action.

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