申请人:Al-Saffar Firas
公开号:US20080319206A1
公开(公告)日:2008-12-25
A process for preparing a protected amidine group of formula (I): wherein R
6
represents, for example, C
1-10
alkyl (optionally substituted), aryl, C
1-3
alkylaryl or C
1-3
alkyloxyaryl; which comprises reacting a nitrile containing compound with an oxyamine of formula (II): R
6
ONH
2
wherein R
6
is as defined above for (I); in the presence of a thio-keto activating agent of formula (III): HS—R
y
, —C(O)-Z wherein Z is -(1-4C)alkyl, —OH, —O-(1-4C)alkyl, —SH, —S(1-4C)alkyl, —NH
2
, —NH(1-4C)alkyl or —N[(1-4C)alkyl]
2
; R
y
is (1-2C)alkyl (optionally substituted); or Z and R
y
are linked so as to form a 5- or 6-membered ring of formula (IV): wherein X is —CH
2
—, —O—, —NH— or —N(1-4C)alkyl; p is 1 or 2; m is 1 or 2 and Rz is independently selected from H, (1-4C)alkyl, halo and amino.