Selective functionalization of cavitands: synthesis of a new hemicarcerand
摘要:
Partly bridged cavitands 2 and 4 can be selectively debrominated in one step by treatment with.5 equiv of n-BuLi in THF to afford the corresponding dibromo derivatives 5 and 6 in 90% and 77% yield, respectively. After incorporation of the fourth bridge, the remaining two bromines can be replaced by CN to give 9 (>95%), C(O)OMe to give 10 (60%) or OH to give 11 (62%). Two molecules of 11 were coupled with CH2BrCl in DMSO/THF under high dilution conditions to give new hemicarcerand 12 in 71% yield.
Selective functionalization of cavitands: synthesis of a new hemicarcerand
摘要:
Partly bridged cavitands 2 and 4 can be selectively debrominated in one step by treatment with.5 equiv of n-BuLi in THF to afford the corresponding dibromo derivatives 5 and 6 in 90% and 77% yield, respectively. After incorporation of the fourth bridge, the remaining two bromines can be replaced by CN to give 9 (>95%), C(O)OMe to give 10 (60%) or OH to give 11 (62%). Two molecules of 11 were coupled with CH2BrCl in DMSO/THF under high dilution conditions to give new hemicarcerand 12 in 71% yield.
Cooperativity between different noncovalent host-guest interactions is the key for the successful generation of selective supramolecular sensors. A new class of cavitands capable of synergistic CH small middle dot small middle dot small middle dotpi interactions and hydrogen bonding has been designed and exploited for the detection of alcohol vapors using mass transducers (see schematic representation).