Stereocontrol in the reduction of 1,2-diimine with an oxazaborolidine catalyst. Highly stereoselective preparation of (R,R)-1,2-diphenylethylenediamine
作者:Makoto Shimizu、Mie Kamei、Tamotsu Fujisawa
DOI:10.1016/0040-4039(95)01825-3
日期:1995.11
Highly enantioselective reduction of 1,2-bis(p-methoxyphenylimino)-1,2-diphenylethane was conducted even with 0.5 mol% of new oxazaborolidine derived form L-threonine and a stoichiometric amount of BH3·THF to give 1,2-diphenylethylenediamine derivative in excellent enantiomeric purity. The subsequent deprotection of nitrogen atoms afforded (R,R)-1,2-diphenylethylenediamine in enantiomerically pure
甚至用0.5mol%的L-苏氨酸衍生的新的恶唑硼烷和化学计算量的BH 3 ·THF进行1,2-双(对甲氧基苯基亚氨基)-1,2-二苯乙烷的高度对映选择性还原,得到1,2-具有优异对映体纯度的二苯基乙二胺衍生物。随后的氮原子脱保护得到对映体纯形式的(R,R)-1,2-二苯基乙二胺。