Photochemical generation of oxa-dibenzocyclooctyne (ODIBO) for metal-free click ligations
作者:Christopher D. McNitt、Vladimir V. Popik
DOI:10.1039/c2ob26581h
日期:——
Oxa-dibenzocyclooctynes (ODIBO, 2a–c) are prepared by photochemical decarbonylation of corresponding cyclopropenones (photo-ODIBO, 1a–c). While photo-ODIBO does not react with azides, ODIBO is one of the most reactive cyclooctynes exhibiting rates of cycloaddition over 45 M−1 s−1 in aqueous solutions. ODIBO is stable under ambient conditions and has low reactivity towards thiols. Photo-ODIBO survives heating up to 160 °C and does not react with thiols.
氧杂二苯并环辛炔(ODIBO,2a-c)是通过相应的环丙烯酮(光-ODIBO,1a-c)的光化学脱羰基反应制备的。虽然光-ODIBO 不与叠氮化物反应,但 ODIBO 是活性最高的环辛炔之一,在水溶液中的环加成速率超过 45 M-1 s-1。ODIBO 在环境条件下很稳定,对硫醇的反应性很低。光-ODIBO 在加热至 160 °C 时仍能存活,并且不会与硫醇发生反应。