First Comprehensive Bakkane Approach: Stereoselective and Efficient Dichloroketene-Based Total Syntheses of (±)- and (−)-9-Acetoxyfukinanolide, (±)- and (+)-Bakkenolide A, (−)-Bakkenolides III, B, C, H, L, V, and X, (±)- and (−)-Homogynolide A, (±)-Homogynolide B, and (±)-Palmosalide C
作者:Timothy J. Brocksom、Fernando Coelho、Jean-Pierre Deprés、Andrew E. Greene、Marco E. Freire de Lima、Olivier Hamelin、Benoît Hartmann、Alice M. Kanazawa、Yanyun Wang
DOI:10.1021/ja0208456
日期:2002.12.1
dichloroketene with dimethylcyclohexenes has been used as the key reaction in an efficient, general approach to the bakkanes. New methods and methodologies that have been developed in this work include spiro beta-methylene-gamma-butyrolactonizations, a vicinal dicarboxylation, an angelic esterpreparation, a transesterification, an epoxy ketone double reduction, and a retro aldol-aldol approach to low-energy aldol
A highly stereoselective formal total synthesis of homogynolide-B the ketoketals and the ketospirolactone starting from Hagemann's ester is described.
描述了从Hagemann酯开始的高立体选择性形式的高乙内酰胺-B,酮基酮和酮螺内酯的全合成。
Direct approach to the bakkanes: A synthesis of (±)-homogynolide-B
作者:Fernando Coelho、Jean-Pierre Deprés、Timothy J. Brocksom、Andrew E. Greene
DOI:10.1016/s0040-4039(00)95255-9
日期:——
COELHO, FERNANDO;DEPRES, JEAN-PIERRE;BROCKSOM, TIMOTHY J.;GREENE, ANDREW +, TETRAHEDRON LETT., 30,(1989) N 5, C. 565-566
作者:COELHO, FERNANDO、DEPRES, JEAN-PIERRE、BROCKSOM, TIMOTHY J.、GREENE, ANDREW +
DOI:——
日期:——
A formal total synthesis of (±)-homogynolide-B
作者:Adusumilli Srikrishna、Sankuratri Nagaraju、Somepalli Venkateswarlu、Uma S. Hiremath、T. Jagadeeswar Reddy、Paloth Venugopalan
DOI:10.1039/a903866c
日期:——
rearrangement of the allyl alcohol 16 and 2-methoxypropene in the presence of a catalytic amount of propionic acid afforded a 3∶2 epimeric mixture of the ketone 15 and further rearranged product 19. Ozonolysis followed by intramolecular aldol condensation and hydrogenation transformed the enones 15a,b into the key intermediate keto ketals 13a and 13b. Methoxymethylene Wittig reaction followed by bromoacetalisation