Synthesis of furan derivatives. LXXXVII. Kinetic studies of the thermal Curtius rearrangement of 2-benzofuroyl azide and related compounds.
作者:HARUO SAIKACHI、TOKUJIRO KITAGAWA、AKIHIRO NASU、HIDEAKI SASAKI
DOI:10.1248/cpb.29.237
日期:——
The kinetics of the thermal Curtius rearrangement of benzoheteroaroyl azides, i.e., 2-benzofuroyl azide (2), 2-benzothenoyl azide (4), 2-indolecarbonyl azide (6), 2-, 3-, 4-, 5-, 6-, and 7-quinolinecarbonyl azides (8, 10, 12, 13, 14, and 15), and 1- and 2-naphthoyl azides (17 and 18), in toluene were studied by infrared spectrophotometry to determine how the annelation of the benzene ring to side b of 2-furoyl, 2-thenoyl, and 2-pyrrolecarbonyl azides (1, 3, and 5) and 2-, 3-, and 4-pyridinecarbonyl azides (7, 9, and 11) affects the rearrangement and its rate. The annelation effect slightly promotes the rearrangement ; the effect on the thiophene ring and pyrrole ring is greater than that on the furan ring, and the effect on the pyridine ring of 4-pyridinecarbonyl azide (11) is greater than that on the pyridine ring of 2- and 3-pyridinecarbonyl azides (7 and 9).
苯并杂芳酰基叠氮化物的热 Curtius 重排动力学,即 2-苯并呋喃酰基叠氮化物 (2)、2-苯并酰基叠氮化物 (4)、2-吲哚羰基叠氮化物 (6)、2-、3-、4-、5-、6通过红外分光光度法研究了甲苯中的-、7-喹啉羰基叠氮化物(8、10、12、13、14 和 15)以及 1- 和 2-萘甲酰叠氮化物(17 和 18),以确定2-呋喃酰基、2-噻吩酰基和 2-吡咯羰基叠氮化物(1、3 和 5)以及 2-、3-和 4-吡啶羰基叠氮化物(7、9 和 11)的 b 侧苯环影响重排及其比率。退火效应略微促进了重排;对噻吩环和吡咯环的影响大于对呋喃环的影响,对4-吡啶羰基叠氮化物(11)的吡啶环的影响大于对2-和3-吡啶羰基叠氮化物的吡啶环的影响( 7 和 9)。