Preparation of diazapentalene derivatives via epoxydation of dihydropyrroles
申请人:Quibell Martin
公开号:US20090005575A1
公开(公告)日:2009-01-01
The present invention relates to a process for preparing a compound of formula I,
wherein
R
1
is Pg
1
or P
1
′;
P
1
′ is CO-hydrocarbyl;
P
2
is CH
2
, O or N-Pg
2
; and
Pg
1
and Pg
2
are each independently nitrogen protecting groups;
(i) reacting a compound of formula II with a dioxirane to form an epoxide of formula III;
where X is selected from CN, CH
2
N
3
, CH
2
NH-Pg
2
, ONH-Pg
2
, NHNH-Pg
2
, N(Pg
2
)NH-Pg
2
;
(ii) converting a compound of formula III to a compound of formula I