Su B, Cai C, Wang Q. Enantioselective approach to 13a-methylphenanthroindolizidine alkaloids.
J Org Chem 2012;
77:7981-7. [PMID:
22946502 DOI:
10.1021/jo3012122]
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Abstract
The first enantioselective approach to 13a-methylphenanthroindolizidine alkaloids is reported, featuring an efficient stereoselective Seebach's alkylation and Pictet-Spengler cyclization. The proposed and other three most probable structures were ruled out, indicating hypoestestatin 1 needs further assignment.
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