Total Synthesis of (+)-Hygrine via Asymmetric Phase-Transfer Catalytic Alkylation.
2006
The first enantioselective synthesis of (+)-hygrine (1) is reported. 1 was obtained in 12 steps with 29% overall yield and 97% ee via asymmetric phase-transfer catalytic alkylation and ring-closing metathesis as key steps. The absolute configuration of (+)-hygrine could be directly confirmed as R.
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