α-Benzylation of (+)- and (−)-N-phenylacetyl imidazolidinones with 2-O-methoxy-methylbezyl bromides, followed by reductive removal of the chiral auxiliary and cyclization, afforded oxygenated isoflavans in excellent enantiomeric excess and yield.
(+)-和(-)-N-苯基乙酰基
咪唑啉酮与2 - O-甲氧基-甲基苄基
溴的α-苄基化,然后还原除去手性助剂并环化,得到氧化的异黄烷醇,其对映异构体过量且收率优异。