A new entry to 1,3-polyols, 2-amino 1,3-polyols, and .beta.-(1-hydroxyalkyl)isoserines using azetidinone frameworks as chiral templates via iterative asymmetric [2 + 2] cycloaddition reactions
摘要:
A new entry to polyfunctional compounds based on an iterative [2 + 2] asymmetric cycloaddition reaction of ketenes to O-protected alpha-hydroxy aldehyde derived imines is described for the first time.
A new entry to 1,3-polyols, 2-amino 1,3-polyols, and .beta.-(1-hydroxyalkyl)isoserines using azetidinone frameworks as chiral templates via iterative asymmetric [2 + 2] cycloaddition reactions
摘要:
A new entry to polyfunctional compounds based on an iterative [2 + 2] asymmetric cycloaddition reaction of ketenes to O-protected alpha-hydroxy aldehyde derived imines is described for the first time.
Antineoplastic Agents. 561. Total Synthesis of Respirantin<sup>1a</sup>
作者:George R. Pettit、Thomas H. Smith、Song Feng、John C. Knight、Rui Tan、Robin K. Pettit、Peter A. Hinrichs
DOI:10.1021/np0680735
日期:2007.7.1
Totalsynthesis of the 18-membered ring cyclodepsipeptide believed to be respirantin (1b) has been achieved. The key step in the synthesis is an intramolecular transesterification of the beta-ketoester alcohol 6 to afford the protected macrocycle 5. The synthetic product was shown to be identical to a natural product presumed to be respirantin (1b), and the absolute stereochemistry of six of the seven