Reductions of 4-alkoxy(or silyloxy)cyclohexanones with LiAlH4, AlH(i-Bu)2, and Li(s-Bu)3BH afforded the corresponding cis alcohols in 73–80% selectivities. Similar reduction of 4-benzyloxy- and 4-t-butyldiphenylsilyloxy-cyclohexanones with AlH(i-Bu)2 in the presence of EtAlCl2 gave trans alcohol (93% selectivity) from the former and cis alcohol (94% selectivity) from the latter, respectively.
用LiAlH4、AlH(i-Bu)2和Li(s-Bu)3BH还原4-烷
氧基(或
硅氧基)
环己酮可以获得相应的顺式醇,选择性为73-80%。在EtAlCl2存在下,用AlH(i-Bu)2对4-苄
氧基和4-t-丁基二
苯基
硅氧基
环己酮进行类似还原,前者获得反式醇(选择性为93%),后者获得顺式醇(选择性为94%)。