Regioselective Transformations of 2?,3?-Seconucleosides into Anhydro Structures and Chiral Crown Ethers
作者:Vinko ?kari?、Vesna ?aplar、?ur?ica ?kari?、Mladen ?ini?
DOI:10.1002/hlca.19920750209
日期:1992.3.18
presence of 1,8-diazabicyclo[5.4.0]undec-7-ene generated the N(3)-methylene-bridged bis-uridine structure 37 and 36, respectively (Scheme 3). Novel chiral 18-crown-6 ethers 40 and 44, containing a hydroxymethyl and a uracil-1-yl or adenin-9-yl as the pendant groups in a 1,3-cis relationship, were synthesized from 5′-O-(triphenylmethyl)-2′,3′-secouridine (2) and 5′-O,N6-bis(triphenylmethyl)-2′,3′-secoadenosine
的2适当保护和活化的衍生物的“分子内环化,3'-secouridine(= 1- 2-羟基-1- [2-羟基-1-(羟甲基)乙氧基] -乙基}尿嘧啶; 1)提供到所述接入2,2'-,2,3'-,2,5'-,2',5'-,3',5'-和2',3'-脱水-2',3'-丝氨酸5 16,17,26,28,和31,分别为(方案1-3)。2',5'-脱水-3'- O-(甲基磺酰基)-(25)与2',3'-脱水-5' - O-(甲基磺酰基)-2',3'-嘧啶(32)的反应1,2-二氮杂双环[5.4.0]十一碳-7-烯的存在下,用CH 2 Cl 2与CH 2 Cl 2生成N(3)-亚甲基桥连的双尿苷结构37分别为36和36(方案3)。新型手性18-冠-6醚40和44,含有一个羟甲基和尿嘧啶-1-基或腺嘌呤-9-基如在1,3-侧基的顺式关系,是从5'-合成ø - (在与3,6,9-三氧杂十二烷-1反应时,