Type 2 Intramolecular Nitroso Diels−Alder Reaction. Synthesis and Structure of Bridgehead Oxazinolactams
作者:Steven M. Sparks、Jesse D. Vargas、Kenneth J. Shea
DOI:10.1021/ol005811m
日期:2000.5.1
[reaction--see text] The type 2intramolecular Diels-Alder cycloaddition utilizing N-acylnitroso dienophiles provides an efficient entry into bridged oxazinolactams. In contrast to the bimolecular counterpart, the reaction is completely regioselective. Structural characterization of the cycloadducts allows for evaluation of the olefin distortion and the degree of pyramidalization of the bridgehead
This invention discloses a rubbery polymer which is comprised of repeat units that are derived from (1) at least one conjugated diolefin monomer, and (2) at least one leaving group-bearing monomer having the structural formula:
wherein R represents an alkyl group containing from 1 to about 10 carbon atoms or a hydrogen atom, wherein R′ represents a methyl group or a hydrogen atom, with the proviso that if R represents an alkyl group then R′ represents a hydrogen atom, and wherein R
1
and R
2
can be the same or different, wherein R
1
represents an alkyl group that is functionalized with a leaving group, wherein R
2
represents a moiety selected from the group consisting of hydrogen atoms, alkyl groups containing from 1 to 18 carbon atoms, aryl groups containing from 6 to 18 carbon atoms, alkaryl groups containing from 7 to 18 carbon atoms, and alkyl groups that are functionalized with a leaving group.
Cross-coupling reaction of 2-(1,3-butadienyl)magnesium chloride with alkyl or aryl halides by lithium chloride-cupric chloride (Li2CuCl4), a superior catalyst