Intramolecular additions allyltrimethylsilane

A [3+3]-type annulation between a,a -dimethoxylated lactam 43 and allyltrimethylsilane gives bicyclic lactam 44. The reaction proceeds presumably through the allylation at the a-position followed by the intramolecular addition of the cation developed at the a -position to the allylic double bond (85JOC3243). The aza-Diels-Alder reaction of... 

Intramolecular conjugate allylation (12, 25).2 Fluoride ion catalyzes intramolecular Michael additions of allyltrimethylsilane to a,p-enones as well as a,p-unsaturated esters, nitriles, and amides Lewis acid catalysis is not effective. The method is particularly suited to cyclopentane annelations.2... 

Intramolecular conjugate additions/ This fluoride ion-catalyzed Michael addition is particularly useful for cyclization of suitably substituted allyltrimethylsilanes with a Michael acceptor. In the examples cited, BE, is not useful, because its use results in desilylation or isomerization. 

Allyltrimethylsilanes react with triplet excited 2,3-dicyano-5,6-dimethylpyra-zine to give diazatricyclooctenes (115), possibly via intermediate (114) formed from ring-opening of an initially-formed [2+2]adduct. Intramolecular [2+2]-cycloaddition yields the pentacyclic compound (116) on irradiation of the corresponding tethered enantiopure bis-2,3-dihydro-4-pyridone. Addition of ethylene to the corresponding a,P-unsaturated-y-lactams in acetone yields (117) and (118) as the major photoproducts. ... 

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