The Vinylketene-Acylallene Rearrangement: Theory and Experiment
作者:Hervé Bibas、Ming Wah Wong、Curt Wentrup
DOI:10.1002/chem.19970030212
日期:1997.2
p orbital of the ketene LUMO. The predicted migratory aptitude in the series of substituted vinylketenes, R-C(CH2 )-CHCO, is in the order N(CH3 )2 >SCH3 >SH>Cl>NH2 >OCH3 >OH>F>H>CH3 , and correlates well with the electron-donating ability of the R group.
Synthesis of Polycyclic Benzofused Nitrogen Heterocycles via a Tandem Ynamide Benzannulation/Ring-Closing Metathesis Strategy. Application in a Formal Total Synthesis of (+)-FR900482
作者:Xiao Yin Mak、Aimee L. Crombie、Rick L. Danheiser
DOI:10.1021/jo2000308
日期:2011.3.18
variety of functionalized substituents at the position ortho to the nitrogen. In the second stage of the tandem strategy, ring-closingmetathesis generates the nitrogen heterocyclic ring. This two-step sequence provides efficient access to highly substituted dihydroquinolines, benzazepines, benzazocines, and related benzofused nitrogen heterocyclic systems. The application of this chemistry in a concise
Total Synthesis of (−)-Cylindrocyclophanes A and F Exploiting the Reversible Nature of the Olefin Cross Metathesis Reaction
作者:Amos B. Smith、Christopher M. Adams、Sergey A. Kozmin、Daniel V. Paone
DOI:10.1021/ja0106164
日期:2001.6.1
and F (1a and 1f) have been achieved. The initial strategy featured the use of a common advanced intermediate to assemble in stepwise fashion the required macrocycle of 1f, exploiting in turn a Myers reductive coupling followed by ring-closingmetathesis. In a second-generation strategy, a remarkable cross olefin metathesis dimerization cascade was discovered and exploited to assemble the requisite [7
Benzannulation via the Reaction of Ynamides and Vinylketenes. Application to the Synthesis of Highly Substituted Indoles
作者:Tin Yiu Lam、Yu-Pu Wang、Rick L. Danheiser
DOI:10.1021/jo401635c
日期:2013.9.20
cyclobutenones with ynamides proceeds via a cascade of four pericyclic reactions to produce multiply substituted aniline derivatives in which the position ortho to the nitrogen can bear a wide range of functionalized substituents. In the second stage of the tandem strategy, highly substituted indoles are generated via acid-, base-, and palladium-catalyzed cyclization and annulation processes.
A [4+4] annulation strategy for the synthesis of eight-membered carbocycles based on intramolecular cycloadditions of conjugated enynes
作者:Julia M. Robinson、Sami F. Tlais、Jennie Fong、Rick L. Danheiser
DOI:10.1016/j.tet.2011.09.031
日期:2011.12
processes. In the first step, the [4+2] cycloaddition of a conjugated enyne with an electron-deficient cyclobutene generates a strained six-membered cyclic allene that isomerizes to the corresponding 1,3-cyclohexadiene. In the second step, this bicyclo[4.2.0]octa-2,4-diene intermediate undergoes thermal or acid-promoted 6-electron electrocyclic ring opening to furnish a 2,4,6-cyclooctatrienone. The latter