This invention provides the substantially pure (R) enantiomer of a compound of the Formula II: ##STR1## The compounds of Formula II are useful in the preparation of the substantially pure (R) enantiomer of angiotensin II antagonists of Formula III: ##STR2## wherein R.sub.1, Ar, R.sub.2 and X are variables.
该发明提供了化合物II的基本纯(R)对映体:##STR1## 公式II的化合物在制备公式III的基本纯(R)对映体的
血管紧张素II拮抗剂中非常有用:##STR2## 其中R.sub.1、Ar、R.sub.2和X是变量。