Synthesis of 5-(2-Phenylethenyl)indolizines by Selective Intermolecular 1,3-Dipolar Cycloaddition of 2-(2-Phenylethenyl)pyridinium N-Ylide with Alkenes Promoted by Tetrakis-pyridine Cobalt(II) Dichromate
نویسندگان
چکیده
منابع مشابه
Regioselective Intermolecular [2 + 2]-Cycloaddition of α-Iodo-Unsaturated Ketones Promoted by Diisobutylaluminum Hydride.
The development of intermolecular [2 + 2]-cycloaddition of α-iodo-unsaturated ketones in the presence of diisobutylaluminum hydride (Dibal-H) is reported to produce various trispirocyclic derivatives containing a cyclobutane ring. This sequential lactonization/[2 + 2]-cycloaddition proceeds in high regioselectivity under mild conditions.
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NbCl(3)(DME)-catalyzed [2+2+2] intermolecular cycloaddition of alkynes and alkenes was successfully achieved to give 1,4,5-trisubstituted-1,3-cyclohexadiene derivatives in good yields.
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The enantioselective intermolecular gold(I)-catalyzed [2+2] cycloaddition of terminal alkynes and alkenes has been achieved using non-C2-chiral Josiphos digold(I) complexes as catalysts, by the formation of the monocationic complex. This new approach has been applied to the enantioselective total synthesis of rumphellaone A.
متن کاملNickel-catalyzed intermolecular [2 + 2] cycloaddition of conjugated enynes with alkenes.
A nickel-catalyzed intermolecular [2 + 2] cycloaddition of conjugated enynes with alkenes has been developed. A variety of electron-deficient alkenes as well as electronically neutral norbornene and 1-decene were applicable to this reaction. The use of conjugated enynes circumvented possible side rections, such as oligomerizations and cyclotrimerizations. The isolation of reaction intermediate ...
متن کامل1,3-Dipolar cycloaddition reactions of 1-(4-phenylphenacyl)-1,10-phenanthrolinium N-ylide with activated alkynes and alkenes.
The 3+2 cycloaddition reaction of 1-(4-phenylphenacyl)-1,10-phenanthrolinium ylide 4 with activated alkynes gave pyrrolo[1,2- 4a][1,10]phenanthrolines 6a-d. The "one pot" synthesis of 6a,b,d from 4, activated alkenes, Et(3)N and tetrakis-pyridine cobalt (II) dichromate (TPCD) is described. The helical chirality of pyrrolophenanthrolines 6b-d was put in evidence by NMR spectroscopy.
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ژورنال
عنوان ژورنال: Journal of Chemical Research
سال: 1999
ISSN: 1747-5198,2047-6507
DOI: 10.1177/174751989902300235