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457698

(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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About This Item

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

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

Application

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

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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Signal Word

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

WGK 3

Flash Point (°F)

39.2 °F - closed cup

Flash Point (°C)

4 °C - closed cup

PPE (personal protective equipment)

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

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