mediate the RAFTpolymerization of ethyl acrylate and N-isopropylacrylamide. Well-defined polymers with controlled molecular weights (Mn = 3700–11 500 g·mol–1) and narrow molecular weight distributions (PDI = 1.06–1.14) were thus obtained that retain the cyclobutene functionality, demonstrating the orthogonality of the RAFT process toward the cyclobutenyl insaturation. Combination of CuACC and RAFT polymerization
An efficient synthesis of the 2-azabicyclo[2.1.1]hexane ring system has been accomplished starting from cis-cyclobut-3-ene-1,2-dicarboxylic anhydride 7, which was prepared using a photochemical method. The key step of this new strategy involved a stereoselective electrophilic addition of phenylselenyl bromide to the double bond of cyclobutene dicarbamate 16 derived from 7. The subsequent ring closure
A short and efficient diastereoselective synthesis of 3,3-bipiperidine and 3,3-bis(1,2,3,6-tetrahydropyridine) was accomplished using a tandem ring-opening metathesis/ring-closing metathesis (ROM/RCM) sequence as a key step. This strategy has been extended to the synthesis of the oxygenated analogues.