Organic photochemistry. 63. Photolytic cleavage of remote functional groups in polyfunctional molecules. Photolysis of exo- and endo-benzobicyclo[2.2.2]octen-2-yl chloride
chiral alcohols in 97−98% ee. 2-Diphenylmethyl-3-quinuclidinone was hydrogenated with the same catalyst to the cis alcohol with perfect diastereo- and enantioselectivity. The reaction of unsymmetrical ketones with a bicyclo[2.2.1] or -[2.2.2] skeleton gave the corresponding alcohols with high stereoselectivity.
RuCl 2 [(S)-binap] [(R)-iphan]和t -C 4 H 9 OK的联合催化剂体系在2-中将3-quinuclidinone和双环[2.2.2] octan-2-one加氢丙醇可提供97-98%ee的手性醇。用相同的催化剂将2-二苯基甲基-3-奎宁环酮氢化成顺式醇,具有完美的非对映体和对映体选择性。不对称酮与双环[2.2.1]或-[2.2.2]骨架的反应得到了具有高立体选择性的相应醇。
Electronic Control of Stereoselectivity in the Metal Hydride Reductions of a Series of Substituted 3,4-Dihydro-1,4-ethanonaphthalen-2(1<i>H</i>)-ones
作者:Keiji Okada、Seiji Tomita、Masaji Oda
DOI:10.1246/bcsj.62.2342
日期:1989.7
The anti/syn stereoselectivity in the metal hydride reductions of a series of substituted 3,4-dihydro-1,4-ethanonaphthalen-2(1H)-ones was studied. The observed steroselectivity sequence was found to be parallel with the homoconjugation sequence except for the case of 5,8-dimethoxy-substituted derivative: the portion of anti attack increases as the benzene ring becomes electron-rich. The results were