Fluorohydration of alkynes via I(I)/I(III) catalysis
作者:Jessica Neufeld、Constantin G Daniliuc、Ryan Gilmour
DOI:10.3762/bjoc.16.135
日期:——
disclose an intriguing example of substrate specificity that was observed whilst exploring catalysis-based routes to generate α-fluoroketones from terminal and internal alkynes under the auspices of I(I)/I(III) catalysis. Utilising p-TolI as an inexpensive organocatalyst with Selectfluor® and amine/HF mixtures, the formation of protected α-fluoroketones from simple alkynes was realised. Whilst the transient
an efficient synthesis of α‐fluoroketones by insertion of hydrogen fluoride (HF) into the gold carbene intermediate, generated from a cationicgold catalyzed addition of N‐oxides to alkynes. This method results in excellent chemical yields for a wide range of alkyne substrates and demonstrates good functional‐group tolerance.
Novel halomethyl derivatives of amines of the following general structure: ##STR1## WHEREIN Y is FCH.sub.2 --, F.sub.2 CH-- or F.sub.3 C--; Z is .beta.-methylthioethyl, .beta.-benzylthioethyl, S-(5'-desoxyadenosin-5'-yl)-S-methylthioethyl, .gamma.-guanidinopropyl, or ##STR2## WHEREIN N IS 2 OR 3 AND R.sub.1 is hydrogen or lower alkyl of from 1 to 4 carbon atoms with the proviso that when R.sub.1 is other than hydrogen, n is 2; and each of R.sub.a and R.sub.b is hydrogen, alkylcarbonyl wherein the alkyl moiety has from 1 to 4 carbon atoms and is straight or branched, alkoxycarbonyl wherein the alkoxy moiety has from 1 to 4 carbon atoms and is straight or branched, or ##STR3## wherein R.sub.2 is hydrogen, a straight or branched lower alkyl group of from 1 to 4 carbon atoms, benzyl or p-hydroxybenzyl; with the provisos that when Z is .beta.-benzylthioethyl or S-(5'-desoxyadenosin-5'-yl)-S-methylthioethyl, R.sub.b is hydrogen, when Z is .beta.-methylthioethyl, Y is other than F.sub.3 C--, and when Z is ##STR4## EACH OF R.sub.a and R.sub.b can be the same or different; and pharmaceutically acceptable salts and individual optical isomers thereof.
新型氨基化合物的卤甲基衍生物,其一般结构如下:##STR1## 其中 Y 为 FCH.sub.2 --,F.sub.2 CH-- 或 F.sub.3 C--;Z 为 β-甲硫乙基、β-苄硫乙基、S-(5'-去氧腺苷-5'-基)-S-甲硫乙基、γ-胍基丙基,或 ##STR2## 其中 N 为 2 或 3,R.sub.1 为氢或由1至4个碳原子组成的较低烷基,但当 R.sub.1 不是氢时,n 为 2;R.sub.a 和 R.sub.b 中的每一个为氢、烷基羰基,其中烷基部分由1至4个碳原子组成且为直链或支链,烷氧羰基,其中烷氧部分由1至4个碳原子组成且为直链或支链,或 ##STR3## 其中 R.sub.2 为氢,由1至4个碳原子组成的直链或支链较低烷基,苄基或对羟基苄基;但当 Z 为 β-苄硫乙基或 S-(5'-去氧腺苷-5'-基)-S-甲硫乙基时,R.sub.b 为氢,当 Z 为 β-甲硫乙基时,Y 不是 F.sub.3 C--,当 Z 为 ##STR4## 时,R.sub.a 和 R.sub.b 可以相同也可以不同;以及其药用盐和光学异构体。