SYNTHESIS OF HETEROCYCLES
285
IV.K.lb-5 Haudrechy, A. et al., SL, 913.
TBDMSO—/,
y — O A c
TBDMSO—<,
*— OAc
Y OMe
Y
N J Î H S ^ 1. Hg(OCOCF 3 ) 2> " ^ Ν ^ ^ γ ^
H
58%
H
IV.K.lb-6 Burrows, C.J. et al., TL, 35, 6215.
X
CbzHN
NHCbz
HN
NH
1 J
cs 2 co 3 ,
U
R^ Ra
R^ R3 61-96%
IV.K.lb-7 Okawa, T. and Eguchi, S., SL, 555.
J^^^CChMe
iA.
RNCO
R'OH
PPh 3
ΊΜ' '1ST "OR'
29-70%
IV.K.lb-8 Vasilevsky, S.F. et al., SC, 24, 1733.
a;
C=C—R
HX, NaN0 2
NH 2
H 2 0
11-93%