Reduction of 5,6-Dimethylidene-exo-2,3-epoxynorbornane with Metal Hydrides. Efficient syntheses of 6-methyl-5-methylidene-anti-3- nortricyclanol and of 2,3-dimethylidene-anti-7-norbornanol
作者:Andr� Chollet、Pierre Vogel
DOI:10.1002/hlca.19780610221
日期:1978.3.8
high concentration of LiAlH4. The reduction of 1 with AlH3 in THF yields 3 as the major product, thus revealing an efficient synthesis of 7-substituted-2, 3-dimethyl-idenenorbornane derivatives. No alcohol 2could be isolated by LiEt3BH reduction of 1. LiAlD4 reduces 1 into the monodeuterated alcohols 2-d, 3-d and 4-d. The deuterium label is found in the endo-position at C (3) in 2-d, in the exo-position
5,6- Dimethylidene-外切-2,3-环氧降冰片烷(1)通过的LiAlH缓慢降低4在沸腾的四氢呋喃(THF)和配料5,6-二亚甲基-外-2-降冰片烷醇的(混合物2)2,, 3-二甲叉基-抗-7-降冰片醇(3)和主要是6-甲基-5-亚甲叉基-抗-3-降冰片烷醇(4)。的产率4是最高的的LiAlH的低初始浓度4 ; 当LiAlH 4高浓度时,它会减少醇2和3的含量。在THF中用AlH 3还原1产生3作为主要产物,因此揭示了7-取代的2,3-二甲基-亚烷基降冰片烷衍生物的有效合成。LiEt 3 BH降低1不能分离出任何醇2。LiAlD 4将1还原成单氘代醇2- d,3- d和4- d。氘标签在发现内型1'-位C(3)在2 -d在C(5)中,在外型位置3 -d和三环醇的甲基在4 -d。用于形成机械极限2,3和4 简要讨论。