Asymmetric synthesis of the F-pyran fragment of the altohyrtins
摘要:
The asymmetric synthesis of a differentially protected F-pyran ring of the altohyrtins has been achieved through an intramolecular cyclisation of a C-43 hydroxyl group onto a C-38-C-39 epoxide. Absolute stereochemistry was derived from an Evans boron aldol to control C-40 and C-41, the C-42-C-43 hydroxyl stereocentres from a Sharpless (-)-diethyl tartrate controlled epoxidation and the remaining stereocentres from substrate controlled diastereoselection. (C) 1999 Elsevier Science: Ltd. All rights reserved.
Asymmetric synthesis of the F-pyran fragment of the altohyrtins
作者:James C. Anderson、Benjamin P. McDermott
DOI:10.1016/s0040-4039(99)01481-1
日期:1999.9
The asymmetric synthesis of a differentially protected F-pyran ring of the altohyrtins has been achieved through an intramolecular cyclisation of a C-43 hydroxyl group onto a C-38-C-39 epoxide. Absolute stereochemistry was derived from an Evans boron aldol to control C-40 and C-41, the C-42-C-43 hydroxyl stereocentres from a Sharpless (-)-diethyl tartrate controlled epoxidation and the remaining stereocentres from substrate controlled diastereoselection. (C) 1999 Elsevier Science: Ltd. All rights reserved.
Asymmetric Epoxide Cyclisation Route to the F-pyran Fragment of the Altohyrtins and Key Aldol Studies
作者:James C. Anderson、Benjamin P. McDermott、Edward J. Griffin
DOI:10.1016/s0040-4020(00)00804-8
日期:2000.10
differentially protected F-pyran ring of the altohyrtins is described, which relies on a key intramolecular cyclisation of a C43 hydroxyl group onto a C38–C39 epoxide. The C38–C39 epoxide stereochemistry was achieved through optimisation of substrate control. Key aldol studies towards coupling the F-pyran ring with an E-pyran ring precursor was investigated, but unsuccessful.