Asymmetric total synthesis of (−)-mangiferaelactone by using an appropriately substituted thiophene as a masked synthon for C-alkyl glycoside
摘要:
Asymmetric total synthesis of naturally occurring nonenolide (-)-mangiferaelactone was attempted through RCAM (ring closing alkyne metathesis) reaction. As the attempted RCAM reaction failed, the synthesis was finally achieved by successful exploration of a ring closing metathesis (RCM) reaction. 2-Propylthiophene was used as a masked synthon for n-heptyl glycoside, which served as main source for one of the RCM precursors and accessed by reductive desulfurization (Mozingo type reduction) of an appropriately substituted thiophene ribofuranoside. The other RCM precursor was accessed by applying an enzymatic kinetic resolution/Mitsunobu inversion sequence to an alkyne alcohol. (C) 2015 Elsevier Ltd. All rights reserved.
Asymmetric total synthesis of (−)-mangiferaelactone by using an appropriately substituted thiophene as a masked synthon for C-alkyl glycoside
摘要:
Asymmetric total synthesis of naturally occurring nonenolide (-)-mangiferaelactone was attempted through RCAM (ring closing alkyne metathesis) reaction. As the attempted RCAM reaction failed, the synthesis was finally achieved by successful exploration of a ring closing metathesis (RCM) reaction. 2-Propylthiophene was used as a masked synthon for n-heptyl glycoside, which served as main source for one of the RCM precursors and accessed by reductive desulfurization (Mozingo type reduction) of an appropriately substituted thiophene ribofuranoside. The other RCM precursor was accessed by applying an enzymatic kinetic resolution/Mitsunobu inversion sequence to an alkyne alcohol. (C) 2015 Elsevier Ltd. All rights reserved.
作者:Susumi Hatakeyama、Mumen F. A. Amer、Keisuke Takahashi、Jun Ishihara
DOI:10.3987/com-06-s(k)44
日期:——
New marine prostanoids, preclavulone lactones, from the Okinawan soft coral Clavularia viridis
作者:Makoto Iwashima、Kinzo Watanabe、Kazuo Iguchi
DOI:10.1016/s0040-4039(97)10211-8
日期:1997.12
Two new marine prostanoids, preclavulone lactones I (1) and II (2) were isolated from the Okinawan soft coral, Clavularia viridis. Their structures were determined based on spectroscopic analysis and chemical synthesis from (S)-malic acid. Preclavulone Lactones with side chains having absolute configurations opposite to those of mammalian prostanoids could be recognized as key intermediates in biosynthesis of clavulones. (C) 1997 Elsevier Science Ltd.
Asymmetric total synthesis of (−)-mangiferaelactone by using an appropriately substituted thiophene as a masked synthon for C-alkyl glycoside
作者:Rajan Kumar、Rohan Kalyan Rej、Samik Nanda
DOI:10.1016/j.tetasy.2015.06.001
日期:2015.7
Asymmetric total synthesis of naturally occurring nonenolide (-)-mangiferaelactone was attempted through RCAM (ring closing alkyne metathesis) reaction. As the attempted RCAM reaction failed, the synthesis was finally achieved by successful exploration of a ring closing metathesis (RCM) reaction. 2-Propylthiophene was used as a masked synthon for n-heptyl glycoside, which served as main source for one of the RCM precursors and accessed by reductive desulfurization (Mozingo type reduction) of an appropriately substituted thiophene ribofuranoside. The other RCM precursor was accessed by applying an enzymatic kinetic resolution/Mitsunobu inversion sequence to an alkyne alcohol. (C) 2015 Elsevier Ltd. All rights reserved.