α-Benzylation of (+)- and (–)-N-phenylacetyl imidazolidinones with 2-O-methoxymethylbenzyl bromide, followed by reductive removal of the chiral auxiliary and cyclization, leads to isoflavans in excellent enantiomeric excess and yield.
(+)-和(-)-N-
苯乙酰基咪唑烷酮与 2-O-甲氧基甲基
溴化苄发生α-苄基化反应,然后还原去除手性助剂并进行环化反应,最终得到异
黄酮,对映体过量,产量极高。