作者:Anthony R. Haight、Timothy L. Stuk、Michael S. Allen、Lakshmi Bhagavatula、Michael Fitzgerald、Steven M. Hannick、Francis A. J. Kerdesky、Jerome A. Menzia、Shyamal I. Parekh、Timothy A. Robbins、David Scarpetti、Jien-Heh J. Tien
DOI:10.1021/op9802071
日期:1999.3.1
The reduction of (SS)-2-amino-5-dibenzylamino-4-oxo-1,6-diphenylhex-2-ene was optimized for diastereoselectivity and overall conversion to (2S,3S,5S)-5-amino-2-dibenzylamino-3-hydroxy-1,6-diphenylhexane (2a), A two-step reduction sequence is described wherein the enamine is reduced with a borane-sulfonate derivative followed by reduction of the resulting ketone with sodium borohydride. The desired 2a was obtained with 84% diastereoselectivity and an acyclic 1,4 stereoinduction ratio of 14:1, This methodology has been used to produce multikilogram quantities of the diamino alcohol core of Ritonavir and should be general to the synthesis of related diamino hydroxyethylene isosteres.