Baker's yeast-induced asymmetric reduction of the keto group activated by the cyclopropane unit.
摘要:
Certain cis-3-substituted 2,2-dimethyl-1-(2-oxopropyl)-cyclopropanes are effectively reduced by baker's yeast to give predominantly (s)-isomers of the corresponding 2-hydroxypropyl derivatives. Reduction of the 2-oxopropyl group proceeds more rapidly (ca. 3.5 times) and with higher stereoselectivity [(S):(R) = 98:2] when the group is attached to the (s)-carbon of the cyclopropane unit than of the keto group attached to the (R)-carbon [(S):(R) = (88):(12)]. Yeast reduction of the keto derivatives is effectively carried out when substituents at C-3 are as follows: CH2COOCH3, -CH2COCH3, -CN, -CH2CN, -CH2CH2OH, and the relative rates of reduction are 36:36:15:13:7. No reduction occurs when substituents at C-3 are propyl, 2-methyl-2-hydroxypropyl or 2-methyl-1,3-dioxolan-2-yl methyl groups.
Baker's yeast-induced asymmetric reduction of the keto group activated by the cyclopropane unit.
摘要:
Certain cis-3-substituted 2,2-dimethyl-1-(2-oxopropyl)-cyclopropanes are effectively reduced by baker's yeast to give predominantly (s)-isomers of the corresponding 2-hydroxypropyl derivatives. Reduction of the 2-oxopropyl group proceeds more rapidly (ca. 3.5 times) and with higher stereoselectivity [(S):(R) = 98:2] when the group is attached to the (s)-carbon of the cyclopropane unit than of the keto group attached to the (R)-carbon [(S):(R) = (88):(12)]. Yeast reduction of the keto derivatives is effectively carried out when substituents at C-3 are as follows: CH2COOCH3, -CH2COCH3, -CN, -CH2CN, -CH2CH2OH, and the relative rates of reduction are 36:36:15:13:7. No reduction occurs when substituents at C-3 are propyl, 2-methyl-2-hydroxypropyl or 2-methyl-1,3-dioxolan-2-yl methyl groups.
Bhat, N. G.; Joshi, G. D.; Gore, K. G., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1981, vol. 20, # 7, p. 558 - 561
作者:Bhat, N. G.、Joshi, G. D.、Gore, K. G.、Kulkarni, G. H.、Mitra, R. B.
DOI:——
日期:——
Mane, B. M.; Gore, K. G.; Kulkarni, G. H., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1980, vol. 19, # 7, p. 605 - 607
作者:Mane, B. M.、Gore, K. G.、Kulkarni, G. H.
DOI:——
日期:——
Baker's yeast-induced asymmetric reduction of the keto group activated by the cyclopropane unit.
作者:Alexey V. Tkachev、Alexey V. Rukavishnikov、Yuri V. Gatilov、Irina Yu. Bagrjanskaja
DOI:10.1016/s0957-4166(00)82103-5
日期:1992.9
Certain cis-3-substituted 2,2-dimethyl-1-(2-oxopropyl)-cyclopropanes are effectively reduced by baker's yeast to give predominantly (s)-isomers of the corresponding 2-hydroxypropyl derivatives. Reduction of the 2-oxopropyl group proceeds more rapidly (ca. 3.5 times) and with higher stereoselectivity [(S):(R) = 98:2] when the group is attached to the (s)-carbon of the cyclopropane unit than of the keto group attached to the (R)-carbon [(S):(R) = (88):(12)]. Yeast reduction of the keto derivatives is effectively carried out when substituents at C-3 are as follows: CH2COOCH3, -CH2COCH3, -CN, -CH2CN, -CH2CH2OH, and the relative rates of reduction are 36:36:15:13:7. No reduction occurs when substituents at C-3 are propyl, 2-methyl-2-hydroxypropyl or 2-methyl-1,3-dioxolan-2-yl methyl groups.