Enantioselective Reduction of Racemic Three-Membered Heterocyclic Compounds. 3. Reaction of Epoxides with B-Isopinocampheyl-9-borabicycolo[3.3.1]nonane-Potassium Hydride and Potassium B-Isopinocampheyl-9 boratabicyclo[3.3.1]nonane Systems$^1$

Enantioselective Reduction of Racemic Three-Membered Heterocyclic Compounds. 3. Reaction of Epoxides with B-Isopinocampheyl-9-borabicycolo[3.3.1]nonane-Potassium Hydride and Potassium B-Isopinocampheyl-9 boratabicyclo[3.3.1]nonane Systems$^1$

ㆍ 저자명: Cha. Jin-Soon,Lee. Kwang-Woo,Yoon. Nung-Min
ㆍ 간행물명: Bulletin of the Korean Chemical Society
ㆍ 권/호정보: 1987년|8권 5호|pp.421-423 (3 pages)
ㆍ 발행정보: 대한화학회
ㆍ 파일정보: 정기간행물|
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ㆍ 주제분야: 기타

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기타언어초록

The chiral B-isopinocampheyl-9-borabicyclo[3.3.1]nonane-potassium hydride (IPC-9-BBN-KH) and potassium B-isopinocampheyl-9-boratabicyclo[3.3.1]nonane (K IPC-9-BBNH) systems were applied to the enantioselective reduction of representative racemic epoxides, namely 1,2-epoxybutane, 1,2-epoxyoctane, 3,3-dimethyl-1,2-epoxybutane and styrene oxide. In the case of IPC-9-BBN-KH system, the optical yields are in the range of 8.3-37.4$\%$ ee. However, the system of K IPC-9-BBNH provides significantly lower optical yields, showing 7-22.5$\%$ ee. These results strongly suggest that the enantioselective coordination of chiral organoborane to the epoxy oxygen of racemic epoxides plays an important role in this resolution

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