Second-generation auxiliary for the asymmetric addition of metalated tetrahydroisoquinolines to aldehydes
摘要:
The selectivity of asymmetric addition of tetrahydroisoquinolyloxazoline Grignard reagents to aldehydes has now been improved to 78-82% ds through the use of a camphor-derived auxiliary. The new auxiliary has broad applicability, with overall yields of chemically and diastereomerically pure addition products now in the 50-58% range.