作者:Jörg A. Heerklotz、Changchun Fu、Anthony Linden、Manfred Hesse
DOI:10.1002/1522-2675(20000809)83:8<1809::aid-hlca1809>3.0.co;2-l
日期:2000.8.9
Allylic N-phenyl imides containing 12- and 14-membered rings, such as compounds 3 and 12, are easily synthesized by ring enlargement from cycloalkanones and phenyl isocyanates. Irradiation of 3 and 12 in EtOH and MeCN, with high- and low-pressure Hg lamps,led, via the photo-Fries rearrangement, to the same primary products: the orthocyclophane 8 and the paracyclophane 9 from 3 (Scheme 2), and the corresponding compounds 13 and 14 from 12 (Scheme 3). Besides the primary photorearrangement products, secondary products, the aminocyclophanes 10 and 11, or 15 and 16, respectively, were also formed. The total yields of the four products were very high when the N-phenyl imides were irradiated in MeCN with a low-pressure Hg lamp: 97 and 93%, respectively If the pam-position in 3 or 12 is blocked by a Me group, the para-photo-Fries rearrangement is prevented. In this case, only one primary photoproduct is formed: the corresponding orthocyclophane (17 or 23, resp.). The most remarkable result was observed on irradiation of the 12-membered N-(4-tolyl) imide 5 in MeCN (low-pressure lamp). It reacted nearly quantitatively to give only two products: 15-methyl-1-aza[12]orthocyclophane-2,12-dione (=16-methyl-2-azabicyclo[12.4.0]octadeca-1(14),15,17-triene-3,13-dione; 17) in 80% yield and 17-amino-14-methyl [11]metacyclophane-1, 11-dione (= 17-amino-15-methylbicyclo[11.3.1]heptadeca-1(17),13,15-triene-2,12-dione; 19) in 16% yield (Scheme 5).