Copper-catalysed synthesis of alkylidene 2-pyrrolinone derivatives from the combination of α-keto amides and alkynes
作者:Qian Wen Tan、Praful Chovatia、Michael C. Willis
DOI:10.1039/c8ob02205d
日期:——
A Cu(I)-catalysed addition and cyclisation sequence has been developed for the synthesis of (E)-alkylidene pyrrolinone derivatives. The reactions incorporate simple α-keto amides and alkynes as substrates, and employ a commercially available Cu(I) catalyst. The process tolerates good variation of both starting materials, and delivers the desired pyrrolinones in good yields, with high levels of stereocontrol
Catalytic Enantioselective Pictet–Spengler Reaction of α‐Ketoamides Catalyzed by a Single H‐Bond Donor Organocatalyst
作者:Rémi Andres、Qian Wang、Jieping Zhu
DOI:10.1002/anie.202201788
日期:2022.5.2
A simple prolinamide bearing a single H-bond donor urea functioncatalyzes the Pictet–Spengler reaction between tryptamines and α-ketoamides to afford 1,1-disubstituted tetrahydro-β-carbolines in excellent yields and enantiomeric excesses.
bioactive natural products remains a long-standing quest in organic synthesis. Enantioselective organocatalysis potentially offers a unique opportunity to solve this problem, especially when combined with complementary modes of activation. Here, we report the sequential association of organocatalytic and superacid activations of simple linear achiral readily available precursors to promote the formation
N-Carboxy α-dehydroamino acid anhydride, derived from N-benzyloxycarbonyl α-dehydroamino acid (DHA) and thionyl chloride, was found to be very useful for the synthesis of N-free DHA ester by alcoholysis and N-acetyl dehydrodipeptide ester by coupling was α-amino acid ester.
N-羧基 α-脱氨基酸酸酐是由 N-苄氧羰基 α-脱氨基酸(DHA)和氯化亚硫酰制得的,发现它在通过醇解合成无氮 DHA 酯和通过偶联合成 N-乙酰脱二肽酯时非常有用。