两种选择性:通过手性锂酰胺的对映选择性Meerwein-Ponndorf-Verley型还原炔基硅烷,然后进行Brook重排和S E 2'亲电取代,可在一锅法中得到标题化合物。在烯丙基硅烷的情况下,生成的乙烯基亚烷基会进行原位[4 + 2]环加成反应,以提供具有非常规的面部选择性的高度官能化的多环化合物。
An exploration of the scope for radical-mediated transannular Diels-Alder reactions in polycycle synthesis
作者:Philip Jones、Wan-Sheung Li、Pattenden Gerald、Nicholas M Thomson
DOI:10.1016/s0040-4039(97)10437-3
日期:1997.12
Treatment of the iododienynone 4 with Bu3SnH-AIBN results in the formation of the tricyclic enone 6 by way of radical-mediatedmacrocyclisation, to 5, followed by transannular Diels-Alder reaction. By contrast, similar treatment of 8 produced the tetracycle 12 (70%) rather than the Diels-Alder product 9, and the analogous system 13 gave rise to the novel tetracyclic diene-dione 18 presumably by way
Cascade radical-mediated cyclisations with conjugated ynone electrophores. An approach to the synthesis of steroids and other novel ring-fused polycyclic carbocycles
作者:Gerald Pattenden、Davey A. Stoker、Nicholas M. Thomson
DOI:10.1039/b703373g
日期:——
A cascade radical-mediated Diels-Alder reaction with the iododienynone 16b produced the tricyclic ketone 17 (22%). By contrast, treatment of the substituted furans 36 and 47 with Bu(3)SnH-AIBN, instead led to the tetracycles 44 and 58 respectively, rather than the anticipated oestranes, i.e. 38 and 48. In a separate study, attempted cascade radical-mediatedcyclisations from the ortho-aryl substituted
Highly Stereospecific, Palladium-Catalyzed Cross-Coupling of Alkenylsilanols
作者:Scott E. Denmark、Daniel Wehrli
DOI:10.1021/ol005565e
日期:2000.2.1
[reaction: see text] Alkenylsilanols bearing methyl ((E)-1 and (Z)-1) or isopropyl ((E)-2 and (Z)-2)) substituents are converted to disubstituted alkenes by a palladium(0)-catalyzedcross-coupling reaction with aryl or vinyl iodides in the presence of tetrabutylammonium fluoride or hydroxide. Yields and stereoselectivities are generally high, and the reaction is compatible with a wide range of functional
1-Methyl-1-vinyl- and 1-Methyl-1-(prop-2-enyl)silacyclobutane: Reagents for Palladium-Catalyzed Cross-Coupling Reactions of Aryl Halides
作者:Scott E. Denmark、Zhigang Wang
DOI:10.1055/s-2000-6292
日期:——
1-Methyl-1-vinylsilacyclobutane (1) and 1-methyl-1-(prop-2-enyl)silacyclobutane (2) undergo rapid and high yielding cross-coupling with aromatic halides. Many different substituents and patterns on the aromatic moiety are tolerated. All reactions can be run at room temperature and require the presence of tetrabutylammonium fluoride and Pd(dba)2. Both silacyclobutanes can be made in one step from commercially available precursors.
Total synthesis of (+)-herbarumin I via intermolecular Nozaki–Hiyama–Kishi reaction
作者:Adão Aparecido Sabino、Ronaldo A Pilli
DOI:10.1016/s0040-4039(02)00359-3
日期:2002.4
The phytotoxin herbarumin I, isolated from Phoma herbarum, was stereoselectively synthesized in 17 steps and 6% yield from l-arabinose featuring the intermolecular Nozaki–Hiyama–Kishi coupling and modified Yamaguchi macrolactonization as key steps.