Synthesis of the C<sub>26</sub>−C<sub>32</sub> Oxazole Fragment of Calyculin C: A Test Case for Oxazole Syntheses
作者:Petri M. Pihko、Ari M. P. Koskinen
DOI:10.1021/jo971167m
日期:1998.1.1
The synthesis of the C-26-C-32 oxazole fragment 4 and its C-32 epimer 20 of serine/threonine protein phosphatase PP1 and PP2A inhibitor calyculin C is presented. The syn methyl arrangement in 4 was established through cyclic stereocontrol. Several methods for oxidizing the intermediate oxazolines 18 and 19 to the finished oxazole fragments were explored. The best results were obtained with oxidations proceeding through the corresponding ester enolate when the carbamate NH side chain was temporarily protected with a TMS group, or with CuBr2/DBU/HMTA-based oxidations. The finished oxazole fragment 4 was obtained in 21% overall yield, starting from Boc-D-alaninal.
Calyculins. Asymmetric synthesis of the C26-C32 fragment
作者:Ari M.P. Koskinen、Petri M. Pihko
DOI:10.1016/0040-4039(94)85330-4
日期:1994.10
An efficient and highly stereocontrolled method for the construction of the natural syn stereochemistry at C30 and C32 in the calyculin C oxazole fragment has been devised starting from alanine. The title fragment itself is accessible in seven steps from N-BOC-alaninal.