两种选择性:通过手性锂酰胺的对映选择性Meerwein-Ponndorf-Verley型还原炔基硅烷,然后进行Brook重排和S E 2'亲电取代,可在一锅法中得到标题化合物。在烯丙基硅烷的情况下,生成的乙烯基亚烷基会进行原位[4 + 2]环加成反应,以提供具有非常规的面部选择性的高度官能化的多环化合物。
Hot couplings without racemization: Protected peptides featuring C‐terminal pseudoprolines were synthesized on a solid support, and these versatile building blocks were used in convergent peptide‐segmentcouplings, which proceeded without racemization even under microwave conditions. The solubility‐enhancing effect of pseudoproline residues facilitated the synthesis of complex RNase 39‐mer glycopeptide