A compound with furyl and vinyl groups was designed as an intermediate for synthesis of macrosphelide H. The furyl group was oxidatively transformed into the key C(5)-O(10) part by a two-step conversion of (1) NBS, H2O: (2) NaClO2 without affecting the free hydroxyl group at C(3). thus furnishing the seco acid, while the Wacker oxidation at the final step was used to convert the vinyl group into acetyl group to afford macrosphelide H. This strategy was applied successfully to synthesis or macrosphelide G as well. (C) 2002 Elsevier Science Ltd. All rights reserved.
Macrosphelides C and F were synthesized by lactonization of 14-oxo seco acids at the O(10)-C(11) bond followed by reduction and Mitsunobu inversion of the resulting hydroxyl group. The seco acids were prepared from the corresponding furans by furan ring-opening with NBS followed by further oxidation of the 4-oxo-2-alkenals with NaClO2. (C) 2001 Elsevier Science Ltd. All rights reserved.
Preparation of O-1∼C-6 and O-7∼C-14 fragments of colletodiol
作者:Hironori Tsutsui、Oyo Mitsunobu
DOI:10.1016/s0040-4039(01)81187-4
日期:1984.1
Synthesis of macrosphelides H and G
作者:Yuichi Kobayashi、Yong-Gang Wang
DOI:10.1016/s0040-4039(02)00781-5
日期:2002.6
A compound with furyl and vinyl groups was designed as an intermediate for synthesis of macrosphelide H. The furyl group was oxidatively transformed into the key C(5)-O(10) part by a two-step conversion of (1) NBS, H2O: (2) NaClO2 without affecting the free hydroxyl group at C(3). thus furnishing the seco acid, while the Wacker oxidation at the final step was used to convert the vinyl group into acetyl group to afford macrosphelide H. This strategy was applied successfully to synthesis or macrosphelide G as well. (C) 2002 Elsevier Science Ltd. All rights reserved.