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-
40
-
-
36549052951
-
-
+].
-
+].
-
-
-
-
41
-
-
36549045924
-
-
Modified AD-mix: OsO4 (2 mol, DHQ)2PHAL for ADmix α (4 mol, or (DHQD)2PHAL for AD-mix γ (4 mol, MeSO2NH2 (1 equiv, K3Fe(CN)6 (3 equiv, K2CO3 3 equiv, t-BuOH-H2O, see ref. 8c
-
2O, see ref. 8c.
-
-
-
-
42
-
-
36549022448
-
-
R (R,R) = 6.50 min].
-
R (R,R) = 6.50 min].
-
-
-
-
43
-
-
36549079909
-
-
Muricatacin (prepared in <1 mmol scale, mp 69-72°C (synthetic product3j mp 68-70°C, α]D20 -19.6 (c 1.0, CHCl3, isolated natural product5 [α]D20 -16.1; reported synthetic produce [α]D23 -19.5 (c 2.1, CHCl3, IR (neat, 3396, 3000-2800, 1727, 1470, 1176 cm-1. 1H NMR (400 MHz, CDCl3, δ, 4.41 (td, J, 7.5, 4.6 Hz, 1 H, 3.57 (m, 1 H, 2.62 (ddd, J, 17.8, 9.9, 5.0 Hz, 1 H, 2.54 (ddd, J, 17.8, 9.5, 9.0 Hz, 1 H, 2.30-2.20 (m, 1 H, 2.17-2.06 (m, 1 H, 1.88 (m, 1 H, OH, 1.60-1.18 (m, 22 H, 0.88 (t, J, 6.7 Hz, 3 H, 13C NMR (100 MHZ, CDCl3, δ, 177.1 (s, 82.9 (d, 73.7 (d, 33.0 (t, 31.9 (t, 29.6 (t, 29.6 (t, 29.6 (t, 29.5 (t, 29.5 (t, 29.5 (t, 29.3 (t, 28.9 (t, 25.4 (t, 24.1 (t, 22.7 (t, 14.1 (q, MS EI, m/z
-
+: 307.2244; found: 307.2239.
-
-
-
-
44
-
-
36549052033
-
-
iso-Cladospolide B (prepared in <1 mmol scale, α]D20 -61.6 (c 0.50, MeOH, isolated natural product4c [α]D28 -61.0 (c 16.6, MeOH, IR (neat, 3487, 3000-2800, 1745, 1462, 1329, 1165, 1097, 1042, 828 cm-1. 1HNMR (400 MHz, CDCl3, δ, 7.46 (dd, J, 5.8, 1.5 Hz, 1 H, 6.18 (dd, J, 5.8, 2.0 Hz, 1 H, 4.99 (dtapp, J, 4.5, 1.8 Hz, 1 H, 3.86-3.66 (m, 2 H, 2.21-1.81 (m, 2 H, OH, 1.66-1.26 (m, 10 H, 1.18 (d, J, 6.2 Hz, 3 H, 13C NMR (100 MHz, CDCl3, δ, 172.9 (s, 153.8 (d, 122.7 (d, 86.2 (d, 71.7 (d, 68.0 (d, 39.0 (t, 33.0 (t, 29.3 (t, 25.5 (t, 25.4 (t, 23.5 (q, ESI-HRMS ESI, m/z calcd for C12H 20O4, Na, 251.1248; found: 251.1253
-
+: 251.1248; found: 251.1253.
-
-
-
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