Synfacts, Table of Contents Synfacts 2025; 21(04): 430DOI: 10.1055/a-2539-3074 Peptide Chemistry Gram-Scale Synthesis of Spirocyclic Prolines and Pyroglutamic AcidsContributor(s): Hisashi Yamamoto , Abhijit Paul Recommend Article Abstract Buy ArticleKeywords Keywordsspiro-prolines - spiro-pyroglutamic acids - Krapcho decarboxylation - Wittig reaction - Michael addition Full Text