Thioorthoesters in the activated Pictet–Spengler cyclization. Synthesis of 1-thiosubstituted tetrahydroisoquinolines and carboncarbon bond formation via sulfonyl iminium ions generated from N,S-sulfonyl acetals
作者
Cláudio C. Silveira,Carmem R. Bernardi,Antônio L. Braga,Teodoro S. Kaufman