Total Synthesis of (+)-Halichlorine: An Inhibitor of VCAM-1 Expression
摘要:
The diastereoselective addition of the highly functionalized organozinc compound 1 to the aldehyde 2 in the presence of the chiral amino alcohol 3 (-->4) is a key step in the first total synthesis of (+)-halichlorine. A series of protections/deprotections and a macrolaconization complete the synthesis. Halichlorine selectively inhibits the expression of the cell adhesion molecule VCAM-1. TBS=tert-butyldimethylsilyl.
Total Synthesis of (+)-Halichlorine: An Inhibitor of VCAM-1 Expression
摘要:
The diastereoselective addition of the highly functionalized organozinc compound 1 to the aldehyde 2 in the presence of the chiral amino alcohol 3 (-->4) is a key step in the first total synthesis of (+)-halichlorine. A series of protections/deprotections and a macrolaconization complete the synthesis. Halichlorine selectively inhibits the expression of the cell adhesion molecule VCAM-1. TBS=tert-butyldimethylsilyl.
Studies towards the total synthesis of halichlorine: asymmetric synthesis of the spiroquinolizidine subunit
作者:Dirk Trauner、Samuel J Danishefsky
DOI:10.1016/s0040-4039(99)01170-3
日期:1999.9
The C1-C15 spiroquinolizidine subunit (cf. 2) of the marine natural product halichlorine (1) was prepared in 12 steps starting from the known 'Meyers-lactam' 5. The synthesis involves a B-alkyl-Suzuki coupling followed by a highly stereoselective intramolecular Michael addition and an intramolecular Mannich ring closure. (C) 1999 Elsevier Science Ltd. All rights reserved.
Total Synthesis of (+)-Halichlorine: An Inhibitor of VCAM-1 Expression
作者:Dirk Trauner、Jacob B. Schwarz、Samuel J. Danishefsky
The diastereoselective addition of the highly functionalized organozinc compound 1 to the aldehyde 2 in the presence of the chiral amino alcohol 3 (-->4) is a key step in the first total synthesis of (+)-halichlorine. A series of protections/deprotections and a macrolaconization complete the synthesis. Halichlorine selectively inhibits the expression of the cell adhesion molecule VCAM-1. TBS=tert-butyldimethylsilyl.