Asymmetric Conjugate Reductions of Coumarins. A New Route to Tolterodine and Related Coumarin Derivatives
作者:Brian D. Gallagher、Benjamin R. Taft、Bruce H. Lipshutz
DOI:10.1021/ol9020404
日期:2009.12.3
The combination of catalytic amounts of [(R)-DTBM-SEGPHOS]CuH in the presence of stoichiometric DEMS (diethoxymethylsilane) in toluene at room temperature leads to asymmetric reductions of 4-substituted coumarins. Several targets or their known precursors can be prepared in high yields and ee’s, including the muscarine receptor antagonist (R)-tolterodine.