Application of the β-azidonation reaction to the enantioselective synthesis of the lycorane Amaryllidaceae alkaloids
作者:Philip Magnus、James M. Bailey、Michael J. Porter
DOI:10.1016/s0040-4020(99)00850-9
日期:1999.12
The prochiral ketone 5 was treated with the lithium salt of (+)-bis(α-methylbenzyl)amine, followed by triisopropylsilyl trifluoromethanesulfonate to give 10 (96%). β-Azidonation of 10 with rapidly produced 11 (95%) as a mixture of trans- and cis- diastereomers in a 3.5:1 ratio. Reduction of 11 with LiAlH4 followed by gave 13. N-Alkylation of 13 with 1,2-dibromoethane followed by radical cyclization