Efficient total synthesis of naturally occurring anti-TMV compound gramniphenol G
作者:Raju M. Walunj、Arun D. Natu、Madhusudan V. Paradkar、Supada R. Rojatkar
DOI:10.1080/00397911.2016.1207782
日期:2016.9.1
ABSTRACT An efficient synthesis of Gramniphenol G identified as 2-(4′-Methoxyphenyl)-7,7-dimethyl-7H-furo[3,2-g]chromene and originally isolated from the plant Arundina gramnifolia belonging to orchidaceae family was accomplished starting from resorcinol. The key step involves the oxidative cyclization of o-vinyl phenol to provide benzofuran moiety. GRAPHICAL ABSTRACT
摘要 禾本科苯酚 G 的高效合成鉴定为 2-(4'-甲氧基苯基)-7,7-二甲基-7H-呋喃[3,2-g]色烯,最初从兰科植物 Arundina gramnifolia 中分离出来。来自间苯二酚。关键步骤涉及邻乙烯基苯酚的氧化环化以提供苯并呋喃部分。图形概要
A protecting group-free divergent synthesis of natural benzofurans <i>via</i> one-pot synthesis of 2-bromo-6-hydroxybenzofurans
作者:Aneesh Sivaraman、Dipesh S. Harmalkar、Jiyoon Kang、Yongseok Choi、Kyeong Lee
DOI:10.1039/c8ob03102a
日期:——
2-Bromo-6-hydroxybenzofurans are potentially versatile intermediates for the divergent synthesis of numerous benzofuran-based natural products and their analogues. Herein we report the first one-pot strategy for the efficient synthesis of 2-bromo-6-hydroxybenzofurans. The present protocol provides shorter routes for the synthesis of moracins M, N, O and P; gramniphenols F and G; and morunigrol C using a protecting
Functional group manoeuvring for tuning stability and reactivity: synthesis of cicerfuran, moracins (D, E, M) and chromene-fused benzofuran-based natural products
作者:Maddali L. N. Rao、Venneti N. Murty、Sachchida Nand
DOI:10.1039/c7ob02459b
日期:——
The protecting group manoeuvring as a strategy was applied in tuning the stability and reactivity of substituted gem-dibromovinylphenols (12a and 22) for the domino synthesis of benzofuran-based natural products. (1–8).
Unified syntheses of gramniphenols F and G, cicerfuran, morunigrol C and its derivative
作者:Kongara Damodar、Jin-Kyung Kim、Jong-Gab Jun
DOI:10.1016/j.tetlet.2016.02.006
日期:2016.3
The first syntheses of natural benzofurans, gramniphenols F and G, morunigrol C and its 3′,5′-di-O-methyl analogue along with the synthesis of cicerfuran are achieved by a unified synthetic sequence using 7-hydroxycoumarin, 5-bromoresorcinol, 2,4-dihydroxybenzaldehyde, and sesamol as building blocks. Ramirez gem-dibromoolefination, Miyaura borylation, Suzuki coupling have been successfully exploited