In this study, a mild and efficient method is developed for the silylation of diverse functional groups using CeO2 nanoparticles (n-CeO2) as solid catalysts with hexamethyldisilazane (HMDS) as silylating agent at roomtemperature. Alcohols, phenols and acids are silylated to their respective silyl derivatives with faster reaction rate while amines and thiols required relatively longer reaction time
Tremorgenic indole alkaloid studies. 6. Preparation of an advanced intermediate for the synthesis of penitrem D. Synthesis of an indole oxocane
作者:Amos B. Smith、John N. Haseltine、Melean Visnick
DOI:10.1016/s0040-4020(01)83440-2
日期:1989.1
We describe here an efficient synthesis of tricyclic aniline 9, an advanced synthetic intermediate which embodies the B-C-D rings of the penitrems (A–F), a small family of tremorgenic mycotoxins produced by the ergot fungus Penicillium crustosum. In addition, we demonstrate the feasibility of a general synthetic tactic for the sequential generation of the E, F, and A rings by construction of a diminutive
The construction of the ring-expanded carbazole system, forming arcyriaflavin homologues, is efficiently accomplished by the reaction of 2,2'-bridged bis-indoles with 3,4-dibromo-2,5-dihydro-1H-2,5-pyrroledione derivatives under Grignard conditions. A ring size of up to nine members in the central ring is achievable. Substitutions either at the indole system or at the imide-N are also possible. The
Indole Diterpenoid Synthetic Studies. The Total Synthesis of (+)-Nodulisporic Acid F
作者:Amos B. Smith、Akin H. Davulcu、László Kürti
DOI:10.1021/ol060290+
日期:2006.4.1
[structure: see text] A stereocontrolledtotalsynthesis of (+)-nodulisporic acid F, the simplest member of a family of novel ectoparasiticidal agents, has been achieved. Highlights of the effective modular synthetic strategy include anionic union of a tricyclic lactone with o-toluidine via our 2-substituted indole synthetic protocol, an optimized C-ring construction protocol, and a late-stage installation
Indole Diterpene Synthetic Studies. Total Synthesis of (+)-Nodulisporic Acid F and Construction of the Heptacyclic Cores of (+)-Nodulisporic Acids A and B and (−)-Nodulisporic Acid D
作者:Amos B. Smith、Akin H. Davulcu、Young Shin Cho、Kazuyuki Ohmoto、László Kürti、Haruaki Ishiyama
DOI:10.1021/jo062422i
日期:2007.6.1
eastern and western hemisphere subtargets via the indolesynthesis protocol developed in our laboratory. Subsequent elaboration of rings E and F, however, revealed the considerable acid instability of the C(24) hydroxyl, thereby preventing further advancement. Nonetheless, preparation of the heptacyclic core of (+)-nodulisporic acids A and B, the total synthesis of (+)-nodulisporic acid F, the simplest member