bicycle: The thermodynamic stability of nitrogen‐containing heterocyclic ring systems is exploited in the first enantioselective totalsynthesis of bacilosarcins A and B, which has been achieved in simple two‐step sequences from amicoumacin C. Bacilosarcin A incorporates a totally unprecedented heterobicyclic ring system and exhibits a remarkably potent herbicidal activity.
Total synthesis of AI-77-B: stereoselective hydroxylation of 4-alkenylazetidinones
作者:Simon D. Broady、Jost E. Rexhausen、Eric J. Thomas
DOI:10.1039/a900334g
日期:——
Cbz-protected leucinal 29, which had previously been deprotonated by tert-butylmagnesium chloride, to give the lactones 30 and 31, ratio 85∶15, after treatment with silica in dichloromethane. Hydrogenolysis gave the aminolactone hydrochloride 52 which was condensed with the acid 27 to give the protected dipeptide 54. Deprotection under acidic conditions gave the dihydroxyazetidinone 55. Treatment with
作者:Simon D. Broady、Jost E. Rexhausen、Eric J. Thomas
DOI:10.1039/c39910000708
日期:——
Stereoselective hydroxylation of the β-lactam ester 8 is a key step in a totalsynthesis of AI-77-B 1.
β-内酰胺酯8的立体选择性羟基化是AI-77-B 1完全合成的关键步骤。
A total synthesis of AI-77-B
作者:Richard A. Ward、Garry Procter
DOI:10.1016/s0040-4039(00)92088-4
日期:1992.6
A short totalsynthesis of AI-77-B (1) is reported, which produces the natural enantiomer using S-leucine and S-aspartic acid as the optically active starting materials.